Which of the Following Represent the Lewis Structure for Ca²⁺ $\mathrm { Ca } : ^ { 2 + }$

Which of the following represent the Lewis structure for Ca²⁺?

A) $\mathrm { Ca } : ^ { 2 + }$
B) $\text { Ca: }$
C)
D)
E) $\mathrm { Ca } ^ { 2 + }$